Ayal Itzkovitz

Technion Israel Institute of Technology, Computer Science, Graduate Student

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Address: Tel Aviv, Tel Aviv, Israel

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Active files: a mechanism for integrating legacy applications into distributed systems

Despite increasingly distributed internet information sources with diverse storage formats and ac... more Despite increasingly distributed internet information sources with diverse storage formats and access-control constraints, most of the end applications (e.g., filters and media players) that view and manipulate data from these sources operate against a traditional file-based interface. These legacy applications need to be rewritten to access remote sources, or need to rely upon ad hoc intermediary applications that aggregate the data into a passive file before executing the legacy application. This paper presents a simple, elegant, programmable method for allowing natural integration of legacy applications into distributed system infrastructures. The approach called active files, enables multiple information sources to be encapsulated as a local file that serves as their logical proxyw. This local file is accessed though a sentinel process, which automatically starts when the file is opened, aggregates data from multiple sources, and filters all access to and from the file. More importantly, the integration of active files into client applications is transparent: an active file is virtually indistinguishable from a regular file. Active files find a variety of applications in both distributed and nondistributed systems. We discuss active files, their semantics, their usage and their implementations in Windows NT.

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Abstract User-level Resource-constrained Sandboxing

The popularity of mobile and networked applications has resulted in an increased demand for execu... more The popularity of mobile and networked applications has resulted in an increased demand for execution “sandboxes”—environments that impose irrevocable restrictions on resource usage. Existing approaches rely on kernel modification for enforcing quantitative restrictions (e.g., limiting CPU utilization of an application to 25%). However, the general applicability of such approaches is constrained by the difficulty of modifying shrink-wrapped operating systems such as Windows NT. This paper presents a user-level sandboxing approach for enforcing quantitative restrictions on resource usage of applications. Our approach actively monitors an application’s interactions with the underlying system, proactively controlling them to enforce the desired behavior. Our approach leverages a core set of user-level mechanisms that are available in most modern operating systems: fine-grained timers, monitoring infrastructure, debugger processes, priority-based scheduling, and pagebased memory protect...

Swste 2012

Software Summit, SWSTE 2014

The Basic Idea

Implementation Issues

In the tradeoff between false sharing and aggregation we found that it is sometimes better to use granularity larger than the sharing unit size, with the cost of some additional false sharing. The main reason is the longer time it takes to bring in a relatively large portion of the memory when fi...

Reduced-Consistency Protocols

Communications service broker for preventing voicemail tromboning in the telecommunications network

Providing session-based services to event-based networks in multi-leg calls

Management of multiple user identities in a communication system

Distributed shared memory system with variable granularity

Service convergence across multiple communication domains

Communication and DSM Server Threads

Access Locality in the Page Table

Acknowledgments and URL

Views, Vpages, and Minipages

Basic Costs in MILLIPAGE

Shared Memory Model

Global Memory Systems

Ayal Itzkovitz

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